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Revision of the Genus Asterorhombus (Pleuronectiformes: Bothidae)

Dannie A. Hensley
Copeia
Vol. 2005, No. 3 (Aug. 2, 2005), pp. 445-460
Stable URL: http://www.jstor.org/stable/4098556
Page Count: 16
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Revision of the Genus Asterorhombus (Pleuronectiformes: Bothidae)
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Abstract

A recent definition of Asterorhombus is composed of only two characters: lack of sexual dimorphism; deep clefts in caudal bones (parhypural, hypurals, epurals). The genus currently contains seven nominal species: A. annulatus, A. bleekeri, A. osculus, A. cocosensis, A. fijiensis, A. intermedius, and A. filifer. Herein the genus is redefined, and as a result, A. annulatus, A. bleekeri, and A. osculus are transferred to Engyprosopon; Asterorhombus is reduced to four nominal species, A. cocosensis, A. fijiensis, A. intermedius, and A. filifer, Asterorhombus fijiensis is shown to be a junior synonym of A. cocosensis. Asterorhombus filifer and A. cocosensis are confirmed to have sexual dimorphism in interorbital width. Species of Asterorhombus were found to show two patterns of distribution: A. intermedius and A. cocosensis, Indo-West Pacific-distributed from the Indian Ocean to the western Pacific, not occurring nonmarginally on the Pacific Plate; A. filifer, Indo-Pacific-distributed from the Indian Ocean to non-marginal localities on the Pacific Plate.

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